Tool-holding turret.



E.l P. BURHELL.

TooL HOLDING TURRET. APPLICATION FILED DEC. I8. I9I3.

1,140,733. A Patented May 25,1915.

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EDWARD r.- :Bi-raamt, or eLnvsLANn. OHIO, AssIGNOn yro THE WARNER AND sWasEY COMPANY, or GLEVELAND, oHIO', A CORPORATION 0F OHIO.

Y'roonitronriiNG runner.

Speceation of Letters latent.

Patented' May 25, 1915.

A'pplicatinledDBeembcl' 18, 1913. Serial No. 807,368.

TOaZZ whom 'it may 00m-em Be ift known that l, EDw'ARnl P. BURREILL, a citizen of the United States, residingA at Cleveland, inthe county of Cuyahogal and E State of Ohio, have invented a certain new and useful Improvement in Tool-Holding Turrets, of which the following is a full, clear, and eX-act description.

This invention relates particularly to novel means, by which arotatable tool holding turret of a lathe may be accurately centered and clamped in various working positions1,-that is to say, witlr'any of its tool holdingv faces in working position.

The invention is shown in connection with a turret intended to be secured upon the cross slide of a lathe; and this particular form of turret also embodies certain improvements by means-of which a tool may be held" upon each ofthe' sides of saidl turret and given a wider range of positional ad justment than has heretofore been possible.

In the' drawing, Figure 1 isa central verticalsection of said turret. Fig. 2 is a side elevation of a turret embodying the invention with a portion of the base member broken away to show the index pinV mechanism. Fig. Sis a sectional plan view in the plane indicated by line 3-3 on Fig. 1.

Fig. 4 is a bottom view of the turret shown in the other figure.

The base member 10 is to be rigidly fastened to the slide by which the turret is to be carried. InV the form shown,which, as

stated, is especially' adapted for use on the cross slide of a lathe', this base is shown in a form such* that it may be detachably secured to said slide; but this is an immaterialdev tail. A tubular cylindrical post 12 extends 40 vertically upward from the base member, and is rigid with it, and the upper .end 12a of this post is conical'ly tapered. The turret 14.- rests upon the base member, and is rotatable around this post. That part 141 of the hole in the turret through which the post passes, which is adjacent to the part 12a of the post, is reversely tapered conically so as to leave between them an annular V- shaped recess. ln this recess are a plurality of segmental V-shaped wed-ges 15 which,

when driven down into the V-shaped annular recess between the post and turret, will accurately center the turret and frictionally secure it to the post.. A shaft 16 extends up from the post. and has au externally the post 12.

threaded portion 16a near its upper end. A nut 17, having an operating handle 17a is screwedV onto the threaded portion 16a of the shaft 16. Below this nut is a cla-mping block 18 which is preferably square and 60 tits freely in a square recess in the upper end of the turret. By turning vrthis nut on the shaft in one direction it will move down on the shaftagainst the clamping block 18, whereby the wedges 15 will be driven down 65 in the annular V-shaped recess so as tol accurately center the turret and clamp it to 'By turning the nut in the contrary direction, the pressure block and wedges are allowed to move upward so asl to free the turret. The shaft 16 in the' form shown has, however, an additional funetion to thatv whichhas been described, namely, to withdraw the index pin 20 from its engagement with the turret so that the A latter may be turned. In order that the shaft may perform this function it is rotatably mounted in the post 12, and projects below as well as above the same. Secured to the lower end of this shaft and lying in a recess in the base member is agnarm 21 having its top face 21a beveled. The index pin 2O is vertically movable in the base member, and it is moved up by a spring 21a so that its upper end may project into anyA of the holes provided therefor in the lower face of the turret. A lever 22 is pivoted to the base; and one end projects into a notch 21b in the index pin, while the other end of the lever projects to a position where it is in the path ofI the beveled surface of the arm 21. Above the threaded portion 16a of the post is a'n external annular fla-nge 16. This flange vin the construction shown is formed by a washerv which embraces are- 96 duced threaded portion 16c on said shaft, and lies below and in engagement with a- .nut 16d which screws onto said reduced threaded portieri'.- The nut 17 lies between this washer andthe clamping block 18.

The turret as shownin the drawing is centered and clamped in work-ing position, and is additionally held against turning by said index pin. 1f, now, the n-ut 17 be turned so as to cause it to travel upward on shaft 16, it will not only release its pressure on the pressure block 18, but will soon come into frictional engagement with the washer 16h. Whenithis has been done, then, by a further turning of the'nut, the shaft 16 will 119 i sa also be turned in that direction which will cause the beveled' surface 21a to engage with and rock lever 22, and thereby draw the index pin 21 out of engagement with the turret. The turret may now be turned by hand to bring any of its faces into working position, which movement will also bring a hole driven down so as to center the turret.

The turret is a polygon having vertical faces which stand at angles to each other. Specifically, it is square, but this particular form is not material. In each of these faces is a horizontal tool recess D which extends from one edge of the face to the other, and these tool recesses are merged the one into the other. Each tool recess therefore lies between an overhanging fiange 25 and a seat or bottom 26. Each of these seats is concave,-the concavity being on the arc of a circle whose center is in a vertical plane midway between the sides of the face. Resting upon each of the concave seats is a wedge 27 whose lower face is convex upon the same curvatureas the seat so as to fit the same.

lThis wedge is, however, thicker at one end than the other, and is substantially shorter than the seat of the tool recess upon which it rests. Set screws 28 and 29 screw down through the overhanging flange of each tool recess. A tool may be put into the tool recess resting upon the liat top face of the wedge 27 therein; saidwedge may be adjusted into any practical. angular position by moving it endwise, and then the tool in this position may be firmly held by screwing the two set screws 28 and 29 down. upon it. The novel features of the desd'ribed means for holding the tool in various angular positions are to be found in the fact that the concave seats for these wedges extend entirely across the face of the turret from one side tojthe other, wherefore each intersects at leach end with the similar concave seat of the tool recess in both adjacent sides and additionally in the fact that the wedges are made i is that the wedge may be taken out and reversed in position so as to permit an equally wide range of adjustment to a tool which is projecting in the opposite direction from said turret. When a tool is caused to project in the opposite direction from that shown in Fig. 2 two other set screws 30 and 31 which screw down through the overhanging flange will be employed to clamp the tool and wedge in the required position.

Having described my invention, I claim:

1. In a lathe the combination of a turret base which is provided with anY outwardly extended cylindrical post having a conically tapered upper end, a turret which is supported on said base member and is provided with a cylindrical hole through which said post passes, which hole adjacent -to thetapered end of the ost is reversely taperel, segmental wedges in the V-shaped recess bctween said post and turret, and means for driving said wedges down in said recess.

2. In a lathe the combination of a turret base which is provided with an outwardly extended cylindrical post having a conically tapered upper end, a turret which is supported on said base member and is provided with a cylindrical hole through which saidV post passes, which hole adjacent to the tapered' end of the post .is reversely tapered, segmental wedges in the V-shaped recess between said' post and turret, a shaft which projects up from said post and is externally threaded, and a nut which is screwed onto said threaded part of said shaft.

3. In a lathe the combination of a turret base which is provided with an outwardly extended cylindrical post having a conically tapered upper end, a turret which is supported on said base member and is provided with a cylindrical hole through which said post passes, which hole adjacent to lthe tapered end of the post is reversely tapered,r

segmental wedges in the V-shaped recess between said post and turret, a 'shaft which projects up from said post and is externally threaded, a nut which is screwed onto said threaded part of said shaft, and a pressure block which loosely embraces said shaft and is interposed between said nut and wedges.

4. In a lathe 'the combination of a turret base which is provided withan outwardlyr extended cylindrical post having a conically tapered upper end, a turret which is supported on said base member and is provided with'a cylindrical hole through which said post passes, which hole adjacent to the tapered end of thepost is reversely tapered,

segmental wedges in the il-shaped recess between said post and turret, a shaft which passes axially through said post and is rotatable therein, which shaft has an externally threaded upward projection and above that an external annular shoulder, a nut which is screwed onto said threaded portion ofthe shaft below said annular shoulder, a In testimony whereof, I hereunto aix my vertically xroyableh spring factuated index signature in the presence' of two witnesses. pin mounte .1n t e base or engagement with the turret, an arm fixed to the lower EDWARD P end of said shaft,' and means whereby said Witnesses:

arm in turning will draw saidindex pin L. I. PORTER,

. down. l v A. J. HUDSON. 

